cleanup: don't update_cache when adding a new repo
cleanup: don't update_cache when adding a new repo

We don't need to update_cache when we add a new repo because
we already do it when we install the package in the follow up task.

Change-Id: I1c32655eddee6c37d7433e6aca8be851344e93e4

openstack/openstack-ansible-galera_client,openstack/openstack-ansible-galera_client